Bereft of any comprehensive analysis and subject to little if any sustained debate, the tangential location of the prohibition of propaganda for war in the discourse of international law has resulted in a situation where state conduct in this area too often appears to be acting in a legal vacuum. In proposing a more robust role for international law in responding to what is a matter of widespread public concern, the book analyses the context in which international law first came to be concerned with propaganda for war in the years following the First World War. With the establishment of the United Nations and the corresponding development of international human rights law, the issue of the prohibition of propaganda for war in both human rights law and international criminal law became a highly significant, yet frequently divisive matter during the Cold War.